Vela Supernova Remnant

ROSAT PSPC image (14° × 14°) of the Vela supernova remnant, which is
about 1,500 light years far away. With the six objects (labelled A - F)
for the first time individual gas fragments were discovered from an explosion
of a star. These projectiles moving with the speed of sound have overtaken
the almost spheric symmetrical explosion shock wave. The border of the
emission regions A, B, D, and E is to a high degree symmetric in respect to
their center lines, which intersect between the remnant's centre and
the present pulsar position.